Motive-fluid-operated tool.



D. s. WAUGH. MOTIVE FLUID OPERATED TOOL. APPLIUATION FILED JUNE 5,1911.

Patented Oct. 29, 1912.

WITNESSES 7 [N VEN T OR A Home Cl/fi M! A. a. WM.

coLdMnw-r inmocmpn co.. WASHINGTON, u, c.

D. S. WAUGH.

MOTIVE FLUID OPERATED TOOL.

APPLIOATION FILED JUNE5,1911.

1 ,042,5 1 2, Patented 001]. 29, 1912. 2 SHEETS-SHEET 2 w I I El I I" WMw 4. 1 l Allorney DANIEL SHAW WAUGH, OF DENVER, COLORADO, ASSIGNOR TOTHE DENVER ROCK DRILL & MACHINERY CO., 01-? DENVER, COLORADO, ACORPORATION OF COLORADO.

MOTIVE-FLUID-OPERA'IED TOOL.

Application filed June 5, 1911.

To all whom it may concern:

Be it known that I, DANIEL S. VVAUGH, a citizen of the United States,residing at Denver, in the county of Denver and State of Colorado, haveinvented new and useful Improvements in Motive Fluid Operated Tools, ofwhich the following is a specification.

The present invention relates to motive fluid operated tools, and theprimary object is to provide simple and effective mechanism forgoverning the supply of motive fiuid thereto, to effect thereciprocation or movement of the piston, said means being readilyaccessible.

A further object is to provide an arrangement that will eliminate alldanger of side thrust of the piston at the end of its return stroke,thereby insuring a quick initial start of said piston on its workingstroke.

A still further object is to provide novel and effective means formaintaining the handle of the tool in position on the body of the same,while permitting a relative rotation between the body and the handle.

The preferred embodiment of the invention is illustrated in theaccompanying drawings, wherein Figure 1 is a longitudinal sectional viewtherethrough. Fig. 2 is a similar view at right angles to Fig. 1. Fig. 3is a cross sectional View on an enlarged scale and on the line 33 ofFig. 1. Fig. 4 is a side elevation of the valve. Fig. 5 is alongitudinal sectional view' through the valve sleeve.

Similar reference numerals designate corresponding parts in all thefigures of the drawings.

In the embodiment illustrated, a cylinder member 6 is employed, having achamber 7 that contains the usual reciprocatory piston 8. Secured to oneend of the cylinder member is a tappet casing 9 containing a tappet 10that is struck by the piston 8. This tappet casing 9 furthermore carriesa chuck 10 for receiving a drill bit or other tool. Secured to theopposite end of the cylinder member 6 is a head 11. that is held againstrotation by a pin 12 threaded into the end of the cylinder member, andengaging in a socket 13 formed in the head. This head has oppositelyprojecting ears 14, through which are passed securing bolts 15 that alsopass through corresponding ears 16 formed 5 in the tappet casing 9. VThe head 11 is pro- Specification of Letters Patent.

Patented Oct. 29, 1912.

Serial No. 631,403.

vided with a stem portion 17 011 which is rotatably mounted the hub 18of a suitable handle 19. This hub is provided at its inner end with anoutstanding annular flange 20, over which are engaged retaining clips 21that are secured upon the head 11 by the bolts 15. It will thus beobserved that these bolts, not only serve to hold the tappet casing 9and the head 11 to the cylinder member, but also constitute fasteningmeans for the handle 19, while permitting a relative rotation betweensaid handle member and head.

Formed upon one side of the cylinder member 6 is a valve chest 22 havingatransversely disposed open ended chamber 23 that is surrounded by threeannular grooves 24, 25 and 26 formed in the inner wall of said chest.Motive fluid is supplied to the central or intermediate groove 24,through a port 27 leading from a chamber 28 and receiving the motivefluid through a pipe or hose line (not shown) coupled at the point 29. Athrottle valve 30, movable to and from a position to close the port 27,constitutes the means for permitting or cutting off the supply of motivefluid to the annular groove 24. From the annular groove 25, a pluralityof ports 31 lead to the rear end of the piston chamber 7, and formed insaid end, are a plurality of annular shallow grooves 32 that intersectthe ports 31, as shown in Fig. 2. Leading from the other annular groove26 of the valve chest, is a conduit or port 33 that extendslongitudinally in one wall of the cylinder member 6, and opens into thefront end of the piston chamber 7, as shown at 34 in Fig. 1. The ports31 and 34 are located on opposite sides of the piston 8.

Fitting snugly in the chamber 23 of the valve chest, is a sleeve 35having a plurality of central radial ports 36 that communicate with thecentral or intermediate groove 24. Other radial ports 37, formed in oneend of said sleeve communicate with the groove 25, while a third series38 and 38 are in communication with the groove 26. The sleeve 35 has theend portions of its bore of different diameters and an automaticreciprocatory valve of the diiferential type, designated generally bythe reference numeral 39, is mounted in said bore. One end 40 of thisvalve is of less diameter than the other end 41, and the intermediateportion of the valve is cut away to form an annular groove 42 that is atall times in communication with the annular groove 24 through theopenings 36. The valve is capable of sufficient move ment in the sleeveto permit the groove 42 to bring the central or intermediate groove 24into communication alternately with the grooves 25 and 26, byalternately uncovering the openings 37 and 38, as will be evident. Theautomatic valve further more has a longitudinal exhaust passage 44formed entirely therethrough.

The open ends of the chamber 23 of the valve chest are closed by caps 45and 46, which are maintained in place by a single bolt 47 that passescentrally therethrough, and centrally through the passage 44 of thevalve 39. The bolt, it will be observed by reference to Fig. 3 is ofless cross sectional area than. the passage so as to permit the flow ofmotive fluid through said passage. The cap 45 is provided with a plugportion 48 that projects inwardly and is adapted to enter the open endof the passage 44 when the valve is shifted to the right in Fig. 3. Itis also provided with a transverse port 49 communicating with a port 50in the valve chest, which port leads from a conduit 51 formed in onewall of the cylinder and ext-ending to a port that opens into the pistonchamber 7, as illustrated in Fig.

2. The port 49 is in communication with an annular groove 53 formed inthe inner face of the cap directly around the plug 48. The cap 46 has aninternal chamber 54 that communicates with the interior of the sleeve 35and with the passage 44, this plug furthermore having exhaust openings55 communicating wit-h the chamber 54.

The operation of the mechanism may be described as follows: With theparts as shown in Fig. 3, if the valve 30 is opened, motive fluid willpass through the port 27 into the central groove 24, and through theports 36 into the groove 42 of the valve. The right hand wall being ofgreater area than the left hand wall of said groove 42, the differencein pressure will cause the valve 39, to move to the right, therebybringing the ports 36 into communication with the ports 37, so that themotive fluid will pass from the groove 24 into the groove 25, andthrough the ports 31 into the rear end of the piston chamber 7 behindthe piston 8, causing the same to be driven to and against the tappet10. YVhen the valve 39, thus moves to the right, it will be evident thatthe conduit 33, which extends to the front end of the piston chamberwill be opened to the outer air, as the left hand end of the valve willuncover the ports 38, and

the air can flow through said conduit 33, ports 38, chamber 54 andexhaust outlets 55 to the exterior of the tool. Just prior to the timethe piston 8 strikes the tappet 10, it

will be shifted to the opposite limit of its movement, thereby bringingthe central groove 42 into communication with the left hand groove 26through the medium of the ports 36 and 38 and the groove 42. As aresult, the motive fluid under pressure will pass through the conduit 33and port 34 into the piston. chamber 7 in front of the piston 8 andcause its return movement. At the same time, the right hand end of thevalve will uncover the ports 37, thereby permitting the exhaust to takeplace through the ports 31, groove 25, ports 37, passage 44 into thechamber 54, and out through the openings 55. As soon as the piston 8upon its return movement again covers the port 52, the pressure of themotive fluid through the conduit 51, ports 50 and 49 and groove 53 willbe relieved, and as a consequence, the valve 39 will move to anintermediate position toward the right, governed entirely by the exhaustof fluid through the ports 31, groove 25, ports 37 and bet-ween theinner end of the plug 48 and the right hand end of the valve into theexhaust passage 44, and out through the chamber 54 and open ings 55. Asthe piston 8 approaches the limit of its return movement, it will passacross the annular grooves 32 and the ports 31, thereby stopping theexhaust as explained, and permitting the differential pressure to againmove the valve to the right, whereupon the piston 8 will start onanother working stroke, being cushioned at the end of its returnmovement, and started on said working stroke by the compression of airin the rear end of the piston chamber 7 behind the ports 31 and grooves32. As soon as it passes the first of said ports 31, the motive fluidagain begins to act on the piston.

In this structure, it will be noted that the clamping washers, whichhold the handle construction, operation and many advantages of theherein. described invention will be apparent to those skilled in theart, without further description, and it will be understood that variouschanges in the size,

shape, proportion and minor details of construction, may be resorted towithout departing from the spirit or sacrificing any of the advantagesof the invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In an instrument of the character set forth, the combination with amotor, of means for supplying motive fluid thereto,

a fluid operated valve for controlling the motive fluid supply, said.valve having a motive fluid passageway therethrough, a

chest containing the valve, a closure for the chest having a port incommunication with the passageway, and fastening means for the closurepassing through the motive fluid passage in the valve and of less crosssecticnal area than the same.

2. In an instrument of the character set forth, the combination with amotor, of means for supplying motive fluid thereto, a fluid operatedvalve for controlling the motive fluid supply, said valve having anexhaust passageway longitudinally therethrough, a chest containing thevalve, a detachable closure for one end of the chest having an exhaustport communicating with the outer atmosphere, and also in communicationwith the longitudinal passageway, and a fastening bolt for the closurepassing through the exhaust passage in the valve and of less crosssectional area than the same.

In an instrument of the character set forth, the combination with amotor, of means for supplying motive fluid thereto, a reciprocatingfluid operated valve for controlling the motive fluid supply, said valvehaving an exhaust passage extending longitudinally therethrough, anopen-ended chest containing the valve, detachable closures for the endof the chest, one of said closures having an inwardly extending nipplethat enters the exhaust passage when the valve is in one position, theother closure having an internal chamber in communication with theexhaust passage and communicating with the outer atmosphere, and aholding bolt passing through the closures and longitudinally through theexhaust passage of the valve, said bolt being of less cross sectionalarea than the passage to permit the exhaust to pass therethrough.

4. In an instrument of the character set forth, the combination with amotor, of a valve chest having an internal chamber and a plurality ofinternal grooves, means for supplying motive fluid to one of thegrooves, the other grooves having communication with the motor, a valvesleeve fitted in the chamber and having ports communicating with thegrooves, a fluid operated reciprocatory valve mounted in the sleeve andcontrolling the ports, said valve having an openended exhaust passagetherethrough, closures for the ends of the chest holding the sleeve inplace, one of said closures controlling the exhaust passage, the otherhaving exhaust ports communicating with said passageway, and a holdingbolt passing longitudinally through the exhaust passage and engaged withthe closures to maintain the same in position, said bolt being of lesscross sectional area than the exhaust passageway, to permit the freeflow of fluid therethrough.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

DANIEL SHAWV VVAUGH.

lVitnesses:

H. LEONARD, J AS. R. ELMENDORF.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

